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Physical Properties of Niobium and Hafnium

Niobium
Hafnium
Physical Properties of Hafnium and Niobium


Physical Properties
Melting Point
2,468.00 °C   
6
2,150.00 °C   
10
Boiling Point
2,468.00 °C   
99+
5,400.00 °C   
5
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
5.50   
7
Brinell Hardness
735.00 MPa   
14
1,450.00 MPa   
6
Vickers Hardness
870.00 MPa   
12
1,520.00 MPa   
5
Speed of Sound
3,480.00 m/s   
21
3,010.00 m/s   
27
Optical Properties
  
  
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
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